. A ray of light is coming along the line y = b1 from the positive direction of
A ray of light is coming along the line y = b1 from the positive direction of the x-axis and strikes the concave mirror placed along the parabola y2 = 4ax. After double reflection the light ray returns along the line y = b1, then
(A) b1b2 = a2
(B) b1 + b2 = 0
(C) b1 = b2
(D) b1b2 + 4a2 = 0
Best Answer
Correct Answer:
(D) b1b2 + 4a2 = 0
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